武汉交通学校群楼爆破拆除塌落振动分析

Collapse vibration analysis of blasting demolition of Wuhan traffic school group building

为了分析一次性爆破拆除多栋建筑造成的地面振动的特征及对周边建筑物的影响,对武汉交通学校群楼爆破拆除中的地面振动进行了测量,并对实测的塌落振动的峰值、频谱特性进行分析。结果表明:此次监测记录到的峰值频率在5～10 Hz,对比高架桥以及单一高层结构爆破拆除数据,倒塌叠加使得振动能量在频谱上分布更加离散,其峰值频率与周边结构自振频率相差变大,周边建筑共振的危险性降低;对于周围的结构而言,水平振动持时大于竖向振动,但水平振动幅值明显小于竖向振动;爆破塌落振动的竖向分量对周围结构的威胁较大,应采取有效的缓冲及隔振措施;由《爆破安全规程》和周边建筑爆破前后主振频率分析可知,本次爆破拆除工作未对周边建筑造成破坏性影响,验证了群楼爆破拆除方案的高效性和安全性。

In order to analyze the characteristics of ground vibration caused by demolition of several buildings by one-off blasting and its influence on surrounding buildings,the ground vibration during blasting demolition of a group of buildings in Wuhan Jiaotong School was measured,and the peak value and spectrum characteristics of the measured collapse vibration were analyzed.The results show that the peak frequency is 5~10 Hz,comparing with the demolition data of viaduct and single high-rise structure,collapse superposition makes the distribution of vibration energy more discrete in frequency spectrum,the difference between predomination frequency and natural frequency of surrounding structure becomes larger,and the danger of surrounding building resonance is reduced;For the surrounding structures,the duration of horizontal vibration is longer than that of vertical vibration,but the amplitude of horizontal vibration is obviously smaller than that of vertical vibration;The vertical component of blasting collapse vibration is a great threat to the surrounding structure,so effective measures of buffering and vibration isolation should be taken.According to the"blasting safety regulations"and the main vibration frequency analysis of surrounding buildings before and after blasting,which verifies the high efficiency and safety of the blasting demolition scheme,the blasting demolition work has not caused destructive effect on surrounding buildings.